we ___ for her beause she never came.
题目
we ___ for her beause she never came.
A needn't wait B shouldn't have waited C mustn't wait D mustn'tA为什么不对,这时needn't后跟动词原形跟came是过去式 也没关系?
答案
B
不应该发生,但发生了.--------came是过去时.
若有needn't have waited,那就是首选了.
举一反三
已知函数f（x）=x，g（x）=alnx，a∈R．若曲线y=f（x）与曲线y=g（x）相交，且在交点处有相同的切线，求a的值和该切线方程．
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
最新试题
热门考点